Vacuum-gage.



H- W. MAURER.

VACUUM GAGE.

APPLICATION FILED m 31, 1907.

Patented 'Mar. 9, 1909.

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APPLIOATIQN FILED MAY 31, 1907.

Patented Mar. 9, 1909.

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H. W. MAURER.

VACUUM GAGE.

APPLICATION FILED MAY 31. 1907.

v I Z 9a m m Wm M m n M w 0W4 3 RM m as m L W a P mw |1 l Ill 1 J 5 3 4 I t 4 g 6 4@\Z Q J 1 m 6 Jn M a 4 5 9 A UNITED STATES HENRY W. MAURER, OF ROCHESTER, NEW YORK, ASSIGNOR, BY MESNE ASSIGNMENTS, TO

TAYLOR INSTRUMENT COMPANIES, NEW YORK.

OF ROCHESTER, NEW YORK, A CORPORATION OF VAG'U'UM- GA GE Specification of Letters Patent.

Patented March 9, 1909.

Application filed May 31, 1907. Serial No. 376,517.

To all whom it may concern:

Be it known that I, HENRY V. MAURER, of the city of Rochester, in the county of Monroe and State of New York, have i11- vented certain new and useful Improvements in Vacuum-Gages; and I do hereby declare the following to be a clear, full, and exact description of the same, reference be ing had to the accompanying drawings, forming a part of this specification, and to the reference-numerals marked thereon.

The present invention relates to vacuum gages and particularly to that type in which there is employed a sealed chamber containing a fluid and an indicating tube depending into the fluid and adapted to be connected to a space to be tested, an object of this invention being to provide an improved construction which will be inexpensive to manufacture and simple in operation.

To these and other ends the invention consists in certain improvements and combinations of parts all as will be hereinafter more fully described the novel features being pointed out in the claims at the end of the specification.

In the drawings: Figures 1 and 2 show respectively front and side elevations of the complete gage constructed in accordance with this invention; Fig. 3 is a view showing in front elevation two end portions of the gage having the front plate removed; Fig. 4 is a vertical section of the same two end portions with the front plate or window frame in place; Figs. 5 and 6 are sections respectively on the lines 55 and 66 of Fig. 1 look ing in the direction of the arrows; Fig. 7 is a side view of the casing body showing the window frame detached and the heads removcd; Fig. 8 is a section on line 8 8 Fig. 1-, and Fig. 9 is a bottom view.

The preferred embodiment of my invention employs a casing which incloses the operative parts of the gage and comprises a casing body 1, a window frame 2, an upper head 3 and a bottom head 4. The casing body is closed by the heads 3 and 4: the upper one fitting within the same and being held therein by any suitable means, as screws 3 and the lower one having two lateral finger pieces or knobs 4 which work in bayonet slots 4: at the lower end of the casing body. To form the casing body a sheet of metal is bent into cylindrical form and an elongated opening is provided in its wall, the side walls 5 of the opening being vertical and the end walls 6 being arched. A glass or transparent plate 8 rests againstthe vertical walls of the opening in rear of the centers of the arched end walls and is held to the window frame 2 by overhanging lugs 9, packing 19 being positioned between the glass and the side and end walls of the frame to exclude dust from the interior of the device. The frame 2 is flanged at 11 to it the wall of the casing about the opening and is held to the casing by hooked lugs 12 having their inner faces beveled at 13 to permit them to ride onto studs 1-fl on the casing to hold the window frame tightly in place.

lVithin the casing is arranged the transparent gage tube 15 which at one end has a tightly fitting connection with a depending hollow boss 16 on the upper head 8, the latter being also provided on its outer face with an externally threaded hollow boss 17 by which the instrument may be connected to any device or apparatus to be tested. The lower end of the gage tube extends into a suitable liquid 18, mercury for instance, in a sealed chamber 19 which is preferably transparent, and is for instance in the form of a square bottle having a stopper 20 through which the gage tube passes and resting on a flanged support 21, being held thereto by an upright 22 fastened at its lower end to the rear of the support and having a spring clip 23 secured to it and extending about the neck of the bottle 19. Also within the casing are two vertically arranged rearwardly converging plates 24, which are positioned one on each side of the gage tube and have their upper adjacent corners fitting in notches in the boss 16 and their lower adjacent corners cut to fit the bottle 19. Horizontal brackets 25 secured in the rear of the plates to the casing support them in proper position, and one of the plates has a scale 26 with which fluid in tube 15 cooperates to indicate the condition of the device or apparatus being tested, the last number 30 of the scale indicating that a complete vacuum exists.

So that the level of the liquid in the chamber 19 may be maintained in the same plane with, or in other words, alined with the zero mark on the scale 26, the liquid chamber 19 is adjustable vertically through the following means: A stud 31 having screw threaded engagement with the bottom of the support flanges 36 projecting into an annular groove 37 in the periphery of the nut, and semi annular flanges 36 extending upwardly through an opening in the bottom head i to hold the semicircular pieces against lat eral displacement; and screws 37 or other devices secure the semicircular pieces 36 within the opening. The support 21 is held against turning by means of two guide rods 38 depending from the lower bracket 25 on opposite sides of the bottle and working in guide recesses 39 in said support.

The proper alinemen't of the liquid surface with the Zero 1 ark may be secured by a rod 40 depending from a plate 2% through an opening in the stopper of the bottle, the lower end of the rod being in a plane with the zero mark, and a porcelain plate 41 being arranged on the support 21 in the rear of the bottle to provide a white back ground for the rod 4-0 that determines the adjustment of the liquid level and thus facilitates the proper adjustment.

The instrument may be supported by horizontal brackets 42 which are formed to re ceive the casing and have attaching ends a3.

The liquid containing vessel is first adjusted until the liquid level is in the plane of the Zero mark on the scale, the rod a0 having its lower end located at a point to corre spond with the zero mark. Then the gage tube is connected by a hollow boss 17 to the apparatus to be tested, the condition of the apparatus being determined by the height to which the liquid rises in the tube.

I claim as my invention:

1. A casing comprising a cylindrical body having elongated opening with vertical side walls and arched end walls, the side walls being arranged in rear of the centers of the arched end walls, a window frame formed to fit about the walls of said opening; a transparent plate for the window frame arranged in rear of the centers of too arched end walls of the frame and heads closing the upper and the lower end of the body.

2. A casing comprising a cylindrical body having an elongated opening with vertical side walls and arched end Walls, studs arranged on the body, a window frame formed to fit about the walls of the opening a transparent plate for the window frame arranged in rear of the centers of the arched end walls, hooked lugs carried by the Window frame to engage with the studs, and heads closing the upper end and the lower end of the body. a

3. The combination with a gage tube and casii'ig inclosing the same and comprising a cylindrical body having an elongated opening formed by vertical side walls and arched end "ails, and a window having a transparent portion arranged in rear of the centers of the arched end wall and in proximily to the gage tube.

a. A casing comprising a cylindrical body having an elongated opening with vertical side walls and arched. end walls, a window frame fo med to fit about the walls of the opening, and a glass arranged in contact with the vertical walls.

5. The combination with a casing and a gage tube arranged therein, of vertically arranged and rearwardly converging plates in the casing, and horizontal brackets arranged between the top and the bottom of the casing and secured to the inner wall of the casing and to the plates.

6. In a gage, a casing, a gage tube arranged therein, a liquid containing bottle into unich the gage tube projects, a flanged support for the bottle, an upright secured to the support, and a clip surrounding the neck of the bottle and secured to the upright.

7. In a gage, a casing, a gage tube arranged in the casing, a liquid containing bottle into which the gage tube projects, a vertically adjustable support for the bottle, vertically arranged and rearwardly converging plates within the casing, a bracket for supporting the plates, and guides for the bottle support depending from the bracket.

8. In a gage, a casing, a liquid containing bottle, a gage tube depending into the bottie, a support for the bottle, and means for adjusting the support comprising a threaded stud on the latter, a nut having an annular groove and two semicircular pieces secured to the bottom of the casing and hav ing flanges projecting into the annular groove in the nut.

9. In a gage, a casing having an opening in its bottom, a liquid containing bottle, a gage tube depending into the bottle, a support for the bottle, and means for adjusting the support comprising a threaded stud on the latter, a nut having an annular groove, and two semicircular pieces secured to the bottom of the casing and having flanges projecting into the annular groove in the nut and flanges projecting into the opening in the bottom.

10. In a gage, a gage tube, a transparent liquid containing bottle into which the gage tube depends, a pair of vertically arranged and rearwardly converging plates within the casing, one on each side of the gage tube,

a scale on one of said plates extending upwardly along the gage tube from a point below the top of the bottle, means for adjusting the bottle and a rod depending into the bottle and having its lower end in a horizontal plane with the zero mark on the scale.

11. In a gage, a gage tube, a transparent liquid containing chamber having the tube depending therein and being slidable thereon, an adjustable support for the liquid containing chamber, a rod depending into the .chamber, a scale extending upwardly along the gage tube, and a light back ground plate carried by the support in rear of the liquid containing chamber, to brighten the surface of the liquid.

12. In a gage, a gage tube, a transparent liquid containing chamber having the tube depending therein and being slidable there on, an adjustable support for the liquid containing chamber, a rod depending into the chamber, a scale extending upwardly along the gage tube, an upright projecting upwardly from the support in rear of the chamber and carrying a clip engaging the transparent chamber, and a light back ground plate secured to the upright.

HENRY W. MAURER.

Witnesses RUssnLL B. GRIFFITH, H. H. SIMMs. 

